I've encountered some terrible bell-wire before. Occasionally, it's made of copper-clad steel, which you only realize after damaging your precision cutters! Consider yourself fortunate it wasn't tinsel wire, a true nightmare without the proper tools. How did you determine it was CCA? Take a short piece of the bare strands, scrape them and boil in washing soda. CCA will disintegrate; copper or copper-clad steel will not. Copper-clad steel can be identified easily with a small magnet.

1. There's a simpler method too: Solid copper's cross-section is purplish-red. CCA's cross-section is silvery. 2. Usage scenarios: 2a) High-frequency & low-current applications, like network cables. 2b) Neutral wire in 3-phase motors, which carries far less current than the live wires. 3. Seeking a refund is often the best route.

You're overcomplicating things. The easiest CCA test is straightforward: Strip stranded wire and hold it over a lighter. If the strands warp and eventually melt, they are CCA. If they maintain their shape and glow red, orange, and almost white-hot, they're copper or copper-clad steel (CCS). A magnet can test for steel. Melting points: - Aluminum: 660.3°C (easily melted with a soldering iron set to 700°C+) - Copper: 1085°C - Steel: 1370°C (hence the magnet test is crucial)

If you want to learn more, please visit our website buy copper clad steel plate.

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Re:copper clad on 416 steel

Re:copper clad on 416 steel

fastfred (Aerospace)

(OP)

24 Feb 05 13:13

We have a torquer ring for a gyro unit made of 416 steel with a copper-coated front surface. The ring aligns with the torquer coil magnetic field. Why is copper-cladding used here? Recently, some rings have weaker magnetic properties, indicating a potential material or process change. Any insights?

RE: Re:copper clad on 416 steel

EdStainless (Materials)

24 Feb 05 14:08

Verify the thermomechanical history of the 416 steel. Check if it's annealed, normalized, or tempered. Examining its mechanical properties and microstructure is crucial. Different batches may have varying hardness and magnetization properties. The copper cladding might be primarily for rust prevention.

RE: Re:copper clad on 416 steel

fastfred (Aerospace)

(OP)

1 Mar 05 08:27

The material was specified only for annealing, and the sole variable was plasma spraying the copper. Could this process affect the magnetic properties?

RE: Re:copper clad on 416 steel

EdStainless (Materials)

1 Mar 05 09:22

I wouldn't expect it to. However, variations in chemistry and annealing could lead to significant property changes. Measure the actual magnetic properties to be sure.

RE: Re:copper clad on 416 steel

UKpete (Electrical)

2 Mar 05 09:08

Just a thought: 416 is martensitic and magnetic. All 300 grades are austenitic and non-magnetic. Could you have the wrong material? Easy to check with a magnet. As for the copper layer, its purpose is unclear without knowing gyro mechanics.

RE: Re:copper clad on 416 steel

prex (Structural)

3 Mar 05 03:01

The copper coat might be there to create eddy currents. If the magnetic arrangement induces a constant magnetic field at right angles to the copper surface facing the gap between the field and the steel ring, one part's rotation could drive the other. This would depend on copper quality, thickness, and the magnetic field's strength. The ring should show strong attraction to a magnet but no residual magnetism.

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